Welcome to M7G. Yeah I suspect the A10 & 6speed models are different. I had to spend a couple hours on youtube to come up with the procedure that worked; the one in the thread linked above.
I was curious, tried it out, and it does work for both sides. Seatbelt light flashes but no chime. With both passengers, I couldn't exit out of the screen showing both belts undone though. When it was just me, it did go away.